Hard water in Chanhassen, MN
Reported by Chanhassen · April 2025
- MN typical
- 160 mg/L
- EPA health violations since 2016
- 0
- Softener for 3 people
- 24k grain
- Data
- Utility report
The water in Chanhassen carries roughly 121 mg/L of dissolved calcium and magnesium, or 7.1 grains per gallon. That is hard water. The number comes from Chanhassen, dated April 2025.
At 121 mg/L, Chanhassen is 39 mg/L below the typical Minnesota figure of 160. Of the 10 nearest cities we track, 2 have softer water and 8 have harder. The range nearby runs from 99 mg/L in Eden Prairie to 420 in Shakopee.
What 121 mg/L means at home
Expect white crust on faucets and showerheads, plus spots on dishes that come out of the dishwasher.
Kettles collect scale quickly. Water heaters build up sediment at the bottom of the tank, which makes them work harder over time.
Soap and detergent need a little more to lather, and soap scum shows up in the tub.
Hardness is not a health problem, and EPA sets no limit for it. It is a matter of scale and soap.
What to do about it
At 121 mg/L most of the trouble is scale, and only a few things deal with it.
Ion-exchange water softener
The standard whole-house fix. It swaps calcium and magnesium for sodium or potassium and needs salt plus a drain. Size it with the calculator below.
Salt-free conditioner
No salt and no drain line. It changes how minerals form scale instead of removing them, so water still tests hard.
Reverse osmosis or carbon filter
Under-sink reverse osmosis removes minerals from drinking water only. Plain carbon filters improve taste but do not soften.
3 people × 75 gallons a day × 7.1 gpg = 1,593 grains a day. A 24,000-grain unit regenerates about every 15 days.
EPA record for Chanhassen's water system
No health-based violations since 2016
Serves about 24,951 people from groundwater.
- Health-based
- 0
- Monitoring or reporting
- 1
- Open now
- 0
Health-based means a contaminant above its legal limit or a missed treatment step. Monitoring and reporting violations are late or missing tests and notices. Source: EPA ECHO, 2026Q3 export, violations with periods starting 2016 or later. Full EPA record.
Questions
Is Chanhassen water hard?
Yes. It measures about 121 mg/L (7.1 grains per gallon), which the USGS classes as hard.
What is the water hardness in Chanhassen in grains per gallon?
About 7.1 gpg. One grain per gallon equals 17.1 mg/L, so 121 mg/L divided by 17.1 gives 7.1.
What size water softener do I need in Chanhassen?
For 3 people using 75 gallons each per day, 7.1 gpg works out to about 1,593 grains a day. A 24,000-grain softener covers that with a regeneration about every 15 days.
Has the Chanhassen water system had EPA violations?
EPA records show no health-based violations for Chanhassen since 2016. There were also 1 monitoring or reporting violation, which are about late or missing tests and notices.
Nearby cities
- Chaska230 mg/LVery hard
- Eden Prairie99 mg/LModerately hard
- Shakopee420 mg/LVery hard
- Minnetonka186 mg/LVery hard
- Hopkins163 mg/LHard
- Minnetrista319 mg/LVery hard
- Edina146 mg/LHard
- Prior Lake196 mg/LVery hard
- Waconia378 mg/LVery hard
- St. Louis Park112 mg/LModerately hard
Hardness data: TapWaterData US Water Hardness (utility report, April 15, 2025), CC BY 4.0. Population: US Census Bureau. Violations: EPA ECHO. How we use them.